Improvement in hot-air furnaces



0. MARCH-AND.

itnesses HOT-AIR FURNACE.

' Patented July 10,1877.

N FEI'ERS. FHOTO-LlTHDGRAP HER, WASHINGTON, D C.

i or overheating;

, leaping over.

CHARLES MABOHAND, OF CLEVELAND, OHIO.

IMPROVEMENT IN HOT-AIR FURNACES.

Specification forming part of Letters Patent No. 192,835-

dated July 10, 1877 application filed May 12, 1877.

To all whom it may concern:

Be it known that I, CHARLES IVIARCHAND, of Cleveland, in the county of Onyahoga and State of Ohio, have invented a new and Improved Hot-Air Furnace, which improvement is fully set forth in 'the following specification and accompanying drawing, in which the figure is a vertical section.

This invention relates to furnaces for generating hot air for heating buildings and the like, and has for its object to furnish a simple and economical apparatus by which the air is heated to a uniform degree without burning and consists of a series of upright pipes surrounding a fire-pot inclosed in a wall or case, whereby the heat, but not the flame, from the fire-pot passes between said pipes for heating them. Said pipes pass directly up through from the bottom, receiving the fresh air'froin below, and as it passes up is heated and accumulated in a receiving and distributing chamber at the top of the apparatus. The joints of the apparatus are so constructed that no gases from the fire can pass into the air-spaces.

In the drawing, A is the base-plate, in the center of which stands a fire'pot, B, provided with a dumping-grate,ashes being discharged into the ash-pit below. A wall, 0, extends upward from the top edge of the fire-pot a sufficient height to prevent the flames from Said wall extends about threefourths the way round, leaving an opening on the side next to the door D. Arising from the aforesaid base-plate A is a series of flues or pipes, E E,"which flues partly surround the lire-pot B and its extension 0. The said series of pipes E E and the fire-pot are inclosed in a sheet-metal wall or case, F, having a closed top, the said pipes communicating from below the base-plate A to a chamber above the aforesaid case F. At the rear side of the case Fis made a smoke-flue, G, the opening into which is located at g, near the bottom. By this arrangement the heat, smoke, and gases from the fire-pot are made to pass downward, around, and between the pipes E before reaching their outlet to the chimney. The'arrows indicate the direction of the smoke and gases. The

joints of the pipes at the top are constructed with sockets, into which a flange on the under side of the top plate sets. The said socket being filled with a cement insures a tight joint, and prevents the escape of gases into the airehamber.

Having described my invention, I claim-- The herein-described hot-air furnace, consisting of the base-plate A, fire-pot B located therein, the extension-wall 0 arranged above the fire-pot, and the flues E, in combination with the gas-tight inclosing-wall F, and the smoke-flue G, havingan outlet, 9, at its base, whereby the heat without the flame is caused to circulate about the pipes, the construction, arrangement, and operation being substantially as shown and specified.

O. MABGHAND.

Witnesses:

GEo. W. TIBBITTS, SAMUEL OSTERHOLD. 

